Shaft construction for generators



Patented Mar. 30, 1920.

I. T. SWARTZ AND A. T. WALLACE.

SHAFT comsmucnow FOR GENERATORS.

, APPLICATION FILED OCT. 22,1917. 1,335,536.

9 ATTORNEYS UNITED STATES PATENT IRA T. SWARTZ AND ALVIE T. WALLACE, OF INDIANAPOLIS, INDIANA, ASSIGNOBS SWARTZ ELECTRIC COMPANY, OF INDIANAPOLIS, INDIANA, A CORPORATION OF INDIANA.

SHAFT CONSTRUCTION FOR GENERATORS.

Application filed October 22, 1917.

To all whom 2'15 may concern:

Be it known that we, IRA T. SWARTZ, a citizen of the United States, residing at Indianapolis, Marion county, and State of Indiana, and ALVIE T. WALLACE, a citizen of the United States, residing at Indianapolis, Marion county, and State of Indiana, have invented and discovered certain new and useful Improvements in Shaft Constructions for Generators, of which the following is a specification.

Our invention relates to shaft construction for electric generators and its object is to provide means for mounting the armature upon its shaft between its bearings in such a way as to avoid the necessity for the use of stepped sections or threaded parts.

lVith this object in view, our invention is embodied in preferable form in the construction hereinafter described and illustrated in the accompanying drawings.

In these drawings, the view shown is a longitudinal section through an armature, its shaft and the bearings for thelatter. Heretofore, in armature shaft assemblies, it has been usual to form separate shouldered and threaded sections on the shaft to re-' ceive the bearing members and the armatures. These parts are then threaded upon the shaft and held against longitudinal movement by their abutment against the fixed collars or shoulders at the ends of the sections.

This construction involves costly inachining of the shaft, results in a shaft with an undesirably reduced tapered end, owing to the successive decreases in diameter of the succeeding sections, and requires considerable time for assemblage of the parts. However, it is necessary to provide means for rigidly and positively locking the armatures against endwise movement, since the armature tends to travel longitudinally under the influence of the magnetic flow, and any relative longitudinal displacement between the armature and field must be prevented, in order to maintain the true magnetic action.

In our invention, the shaft 1 of the armature is straight and cylindrical and of the same diameter throughout its length except at one extreme termination where it is tapered to receive the hub of a fly wheel. On this straight shaft is mounted an inner Specification of Letters Patent. Patented 11 30, 192() Serial No. 197.947.

bearing member 2 at one end of the shaft adjacent the crank and adapted to cooperate with an outer ball bearing member 3, which may be carried by any suitable casing or fixed supporting structure. This bearing member 2, which may be formed integral with the shaft, bears against the crank check L which is fixed to the shaft. Adapted to bear against the other end of said member so as to force it rigidly against the cheek and thus hold it to the shaft is a hollow, cylindrical sleeve or quill 5 adapted to be slid freely down upon the shaft from the tapered end thereof. This quill is provided with a cross slot 6 in its end, which is adapted to engage the side of a removable key 7 which is inserted through the shaft armature sleeve. One end of the sleeve 8 of the armature 9 abuts against this quill and is engaged by the key 7 and by a similar key 10, which serve to hold the armature fixed on the shaft against rotative move-- ment relative thereto. The armature and its sleeve are slipped upon the shaft after the quill 5 has been placed thereon. Then bearing member 11 which has mounted thereon ball bearing 12 is placed on the shaft against the end of the armature sleeve and all these parts firmly locked in position against longitudinal and rotative movement relative to the shaft by means of single clamping nut 13 engaging a short threaded section of the shaft which constitutes the only part of the shaft on which is necessary to cut screw threads.

The arrangement described holds the parts rigidly in correct position and avoids the necessity for turning the shaft and also enables the armature and bearings to be much more quickly assembled than with the usual form of mounting.

Having thus described our invention, what we claim is:

1. In shaft constructions for armatures, in combination with the shaft, an armature and a sleeve fixed to the latter, bearing members on the shaft on either side of the sleeve, a loose spacing and looking sleeve between one bearing and one end of the armature sleeve, a key to prevent rotation of the armature, said spacing and locking sleeve being formed to engage said key, and adjustable locking means for forcing the armature sleeve, loose sleeve and bearings to the shaft, bearing members at the ends of the shaft, a spacing and clamping sleeve between one of the bearings and said armature sleeve and engaging one of said keys, and a nut threaded on said shaft and bean ing against the other bearing member to clamp said parts together.

In Witness whereof, we have hereunto set 15 our hands and seals at lndianapolis this 8th day of October, A. 1)., nineteen hundred and seventeen.

IRA T. S WARTZ. [n.s.) ALVIE T. WALLACE. 11L. sx]

Witnesses:

Q. WV. LESTER, CLARA Sonnonnnn. 

